Combination-tool.



No 835,698. PATENTED NOV. 13, 1906.

R. BARTHOLOMUS.

COMBINATION TOOL.

APPLIOATION FILED 0011.26, 1905.

Z SHEETS-SHEET 1.

PATE-NTED- NOV. 13, 1906..

R. BARTHOLOMUS. OMBINATIONTOOL. APPLICATION FILED 00:13.26, 1905.

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UNITED sTATEs RUDOLF BAR'IHOIJ'OMUS, OF DRESDEN, GERMANY.

COMBINATION-TOOL.

Y Specification of Letters Patent.

Patented Nov. 13, 1906.

Application iiled October 26,1905. Serial No. 284,470.

To all 'Lu/wm, t may concern.'

Be it known that I, RUDOLF BAETHOLO- MUs, a subject of the GermanEmperor, residing at Dresden, Germany, have invented certain new anduseful Improvements in Combination-Tools, of which the following is aspeciiication.

The present invention relates to an improved combination-tool which byreason of its comparatively light weight and its general handiness isespecially adapted to be carried about by the operator when working awayfrom the shop and which allows of quickly changing from one operation toanother.

In the accompanying drawings, Figure 1 represents a vertical sectionalelevation, Fig. 2 a plan view, and Fig. 3 a side elevation, of the tool.Figs. 4, 5, and 6 represent, respectively, detail parts for cutting, forscrew-threading, and for drilling.

The casing 1, carrying the various operating parts, 1s to be secured toa vise, a workbench, or other suitable rigid obj ect with its projection2 and is provided at 3 with a centering-chuck operated Vby the screw 4for clamping the work-piece in central position. In the upper part 5 ofthe casing operates a hollow screw-sleeve 6, within which is rotatablyournaled the hollow spindle 7, which carries at its lower end the holder8 for the cutting-knives 9. As shown, the pins 15 of the cutting-knives9 are guided in eccentric slots 14 in thecutter-head 8, and byinsertinga pin 12 in a groove 13 provided in the casing 8 and rotatingthe hollow spindle 7 one way or the other by means of the crankhandle 11these knives will be caused to move toward or away from each other. Thepin 12 is slidingly arranged in a suitable bracket on the chuck part 3and is ordinarily retracted so that itis out of engagement with thecutter-head. For settingV the knives, the cutter-head 8' is lowered andthe pin 12 inserted in the groove 13, thereby holding the cutter-headrigid.

A pointer 16 moving over a fixed scale 17 on casing 1 shows the positionof the knives, which latter are locked in place in any suitable mannerwell known in the art when set to the proper radial position.

For automatically regulating the advance (feed) of the operating-spindle7 the following mechanism is employed: The ring 10, to which is securedthe crank 11 and which is rigidly secured to the spindle 7, carries astud 19, upon which rotates between frictionwashers a toothed wheel 18.A thumbscrew 20 allows of regulating the degree of friction betweentoothed wheel and washers. To the upper end of the sleeve 6, whichscrews up or down in the part 5 of the casing 1, are secured a number ofradial pins 21 in such position that upon the crank-handle 11 beingactuated these pins 21 mesh with the toothed wheel and the sleeve 6 iscaused to intermittently rotate and thereby work up or down in thecasing 1. When feeding, the sleeve will descend upon the work-pieceuntil the cutting lmives have "bit when the resistance caused by thebiting action of the knives will overcome the frictionalresistancebetween wheel 18 and washers and the wheel 18 will rotate about its stud19 without further iniluencing the sleeve 6. The result will be that theoperating parts do not descend any farther until the knives have cuttheir way, when the friction-wheel 18 will come into action again andcause further feeding operation. The operating parts thus gradually workdown upon the workiece.

p If the described device is to be used, for instance, for cuttingscrew-threads, I employ a'spindle or tool holder23, (shown in Fig. 5,)provided with a keyway and adapted to slide longitudinally within thehollow spindle 7 on keys 22. the spindle 7 is slit so that by tighteningthereon the conical screw-cap 24 the spindle 23 can be rigidly clamped.To the lower end of the spindle 23 can be secured in suitable manner thedie-holder 25. For drilling purposes the die-holder is removed, thespindle 23 reversed, inserted and clamped inthe hollow spindle 7, andthe drill 26 inserted, as shown in Fig. 6.

For showing the attained depth of feed, there is provided a graduation27 on the casing 1, Fig. 1'

What I claim isv A tool for cutting, shaping, drilling, thread-cuttingand like purposes, comprising in combination, a casing, :means forsecuring it to a fixed support, a centering-clutch forming the lowerpart of said casing, 4a sleeve threaded in said casing, a hollow spindlerotatable within said screw-sleeve, a cutting-head at the lower end ofsaid hollow spindle, a handled ring rigidly secured on The upper partofI IOO IIO

' said hollow spindle, a stud mounted on said In testimony whereof I aHXmy signature ring, a toothed freton-whee1 operating on in presence oftwo witnesses. said stud, means to regulate the. frctonal RUDOLFBARTHOLOMUS reslstanee of sard fr lctlon-wheel, plns radlating from saidscrew-Sleeve and arranged to Witnesses: be engaged by said toothedJroton-wheel, PAUL E. SCHILLING,

substantially as described. y PAUL ARRAS.

